Polyblastia ardesiaca (Bagl. & Carestia) Zschacke
Hedwigia, 55: 292, 1914 - Thelidium ardesiacum Bagl. & Carestia, Comm. Soc. Critt. Ital., 2: 84, 1864.

Synonims: Clauzade & Cl.Roux nom. inval., Polyblastia rivalis (Arnold) Zschacke ?, Polyblastia sprucei (Anzi) Arnold, Polyblastia verrucosa f. hydrophila Asta, Sagedia sprucei Anzi, Thelidium rivale Arnold ?, Verrucaria cryptarum v. detersa Garov.

Is present in the following regions (Click here for a map with abbreviations):
N - Fr, Ven, Lomb, Piem (Isocrono & al. 2004). C - Marc (Nimis & Tretiach 1999).

References (type author's name):

Click here to view the pictures of this taxon
Polyblastia ardesiaca (Bagl. & Carestia) Zschacke

Click here to search the TSB Herbarium for samples of this taxon.

Photobiont: Green algae other than Trentepohlia
Growth form: Crustose
Reproductive strategy: Mainly sexual
On: periodical submerged, e.g. in creeks or on coastal maritime rocks
Poleophoby: 3


  • pH of the substrata: basic (5)
  • in sites with diffuse light but scarce direct solar irradiation (3)
  • humidity requirements: hygrophytic (1) to rather hygrophytic (2)
  • in sites with no eutrophication (1)
  • from the oroboreal belt of the Alps (4) to the vegetation above treeline (5)

    Note: periodically submerged in mountain creeks, most frequent in the Alps.

      Commonness-rarity status:
    • Alpine Italy: rare
    • Subalpine Italy: very rare
    • Oromediterranean Italy: absent
    • Montane Italy: absent
    • Padanian Italy: absent
    • Dry submediterranean Italy: absent
    • Dry mediterranean Italy: absent
    • Humid submediterranean Italy: absent
    • Humid mediterraenan Italy: absent